GNSS Space-Time Interference Mitigation and Attitude Determination in the Presence of Interference SignalsReport as inadecuate




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PLAN Group, Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada





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Academic Editor: Vittorio M.N. Passaro

Abstract The use of Space-Time Processing STP in Global Navigation Satellite System GNSS applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression. However, the resulting distortion and bias on the cross correlation functions due to space-time filtering is a major limitation of this technique. Employing the steering vector of the GNSS signals in the filter structure can significantly reduce the distortion on cross correlation functions and lead to more accurate pseudorange measurements. This paper proposes a two-stage interference mitigation approach in which the first stage estimates an interference-free subspace before the acquisition and tracking phases and projects all received signals into this subspace. The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process. Attitude parameters enable the receiver to estimate the steering vector of each satellite signal and use it in the novel distortionless STP filter to significantly reduce distortion and maximize Signal-to-Noise Ratio SNR. GPS signals were collected using a six-element antenna array under open sky conditions to first calibrate the antenna array. Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios. View Full-Text

Keywords: antenna array receiver; global navigation satellite system GNSS; interference mitigation; space-time processing antenna array receiver; global navigation satellite system GNSS; interference mitigation; space-time processing





Author: Saeed Daneshmand * , Ali Jafarnia Jahromi, Ali Broumandan and Gérard Lachapelle

Source: http://mdpi.com/



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